If we were evolving before, why aren't we evolving now?

We are still evolving, as is everything around us. The process is slow and takes many generations to see observable differences. It is easy to see this in bacteria, which replicate fast, and you relatively apparent in insects, crops, rodents, etc. Since the human generation time is in the range of 20-30 yrs, it needs to be observed for a much longer period, but humans 10,000 years from now would be as different from us now, as we are from our ancestors 10,000 years ago.

Last edited by Christopher LaRock (23rd Mar 2012 17:11:11)

Why do you assume we are no longer evolving?  There's plenty of evidence to suggest growing variation and potential selection in modern human populations.  Have a look through past answers on this subject with the search box up in the top right.

Here's a couple of similar themed questions:

http://www.askabiologist.org.uk/answers … hp?id=5170

http://www.askabiologist.org.uk/answers … hp?id=8073

http://www.askabiologist.org.uk/answers … hp?id=7711

http://www.askabiologist.org.uk/answers … hp?id=6933

There have been a lot of studies on the evolution of human genes, aided by the sequencing of the genome and the development of associated analytical tools. Those such as - http://www.ncbi.nlm.nih.gov/pubmed/16494531 - provide evidence for relatively recent positive selection of some genes in a number of populations. There is also considerable interest in pathogen-induced selection pressures (e.g., see http://www.ncbi.nlm.nih.gov/pubmed/22312055), particularly those that may be associated with a HIV resistance allele (which appears to have arisen about 5,000 years ago) of the chemokine receptor CCR5.